They're both fediverse, but one is designed to follow communities, and the other is designed to follow people. A Mastodon user sees a community as a user, and can thus subscribe to it. There's not really a way for a Lemmy user to do the inverse and subscribe to a user.
If you want a platform that does both (can subscribe to both communities and users), check out Kbin.
Not really.
They're both fediverse, but one is designed to follow communities, and the other is designed to follow people. A Mastodon user sees a community as a user, and can thus subscribe to it. There's not really a way for a Lemmy user to do the inverse and subscribe to a user.
If you want a platform that does both (can subscribe to both communities and users), check out Kbin.